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long totalStartTime = System.nanoTime();
    for (int fileIndex = 0; fileIndex < fileNum; fileIndex++) {
      // file path
      String path =
          "/home/fit/szs/data/data/sequence/root.sg/0/"
              + chunkNum
              + "/test"
              + fileIndex
              + ".tsfile";

      // aggregation query
      try (TsFileSequenceReader reader = new TsFileSequenceReader(path)) {
        Path seriesPath = new Path(DEVICE1, "sensor_1");
        long startTime = System.nanoTime();
        TimeseriesMetadata timeseriesMetadata = reader.readTimeseriesMetadata(seriesPath, false);
        long count = timeseriesMetadata.getStatistics().getCount();
        costTime += (System.nanoTime() - startTime);
      }
    }
    System.out.println(
        "Total raw read cost time: " + (System.nanoTime() - totalStartTime) / 1000_000 + "ms");
    System.out.println("Index area cost time: " + costTime / 1000_000 + "ms");